Click here to see the SAS code.Click here to see the example.
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This graph is pretty straightforward.
I did some internet research to find raw data & example plots,
mainly from the following pages:
http://www.daviesand.com/Choices/Precautionary_Planning/New_Data/
Using CO2 data from:
http://cdiac.esd.ornl.gov/trends/co2/vostok.htm
http://cdiac.esd.ornl.gov/ftp/trends/co2/vostok.icecore.co2
http://cdiac.esd.ornl.gov/trends/co2/graphics/vostok.co2.gif
Using Temperature data from:
http://cdiac.esd.ornl.gov/trends/temp/vostok/jouz_tem.htm
http://cdiac.esd.ornl.gov/ftp/trends/temp/vostok/vostok.1999.temp.dat
http://cdiac.esd.ornl.gov/trends/temp/vostok/graphics/tempplot5.gif
I downloaded/saved their data files, and then read them into
sas datasets (the only 'tricky' part there was telling sas
that one file was tab-delimited, whereas the other was space-
delimited).
I then combined the 2 datasets, and plotted them on the same
graph using "proc gplot" with a plot and a plot2 statement.
I use axis statements to scale both sets of data similarly,
and color & angle the axis labels, etc.
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Note on graph presentation: The heavier temperature lines 160,000 BP
to present reflect more data points for this time period, not necessarily
greater temperature variability.
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